variance of estimated

It revealed that the product of the standard deviation of the estimated sampling variance and square root of the number of samples was a constant.

实验也证明，取样方差估计值的标准偏差与样本数目的平方根之积可近似为一常数。

Except the parameter estimation ( 1), the other four items ( 2)~ ( 5) all require that the variance-covariance matrix of the basic vector including the observations, the estimated parameters, the residuals and the adjustments of the observations are explicit and computable.

除参数估计（1）外，其余四项内容都需要基本向量（包括观测量、参数估计量、残差向量以及观测量平差量）的方差协方差矩阵具有明显可计算的形式。

First, for threshold in the wavelet domain, a semi-soft threshold function that showed the advantages over hard and soft threshold function with respect to variance and bias of the estimated value is used.

对于小波阈值，使用了根据估计值变量和偏差的能显示软硬阈值的半软阈值函数。GMM普遍用于说话人识别系统中，并且在宽带语音中表现出了很好的性能。

The height growth of the seedlings showed high inheritance stability; the variance component of the family x site interaction was very small and insignificant ( 0.38%)-The estimated family broad sense;

一年生苗木高生长表现出高度的遗传稳定性，家系×地点互作方差分量非常小（0.38%），是不显著的。